Electronic siren

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible

Patent

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1005

Patent

active

D04060741

REFERENCES:
patent: D275843 (1984-10-01), Sharenow
patent: D345317 (1994-03-01), Ossa
patent: D382221 (1997-08-01), Chen
patent: D397636 (1998-09-01), Chu

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